Buffer overflow in Valkey-Io Valkey
CVE-2026-82677
A vulnerability was determined in valkey-io valkey 9.1.0. Impacted is the function moduleTimerHandler of the file src/module.c of the component Module Timer Subsystem. This manipulation causes double free. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: b349fe2821e3998534b1454c1b64a478daf8c6b7. To fix this issue, it is recommended to deploy a patch.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.4 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (42.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Valkey-Io Valkey — versions 9.1.0
Weakness classification (CWE)
References
- github.com/user-attachments/files/30118801/PoC.zip (exploit)
- github.com/valkey-io/valkey/ (product)
- github.com/valkey-io/valkey/commit/b349fe2821e3998534b1454c1b64a478daf8c6b7 (patch)
- github.com/valkey-io/valkey/issues/4200 (issue-tracking)
- github.com/valkey-io/valkey/pull/4211 (issue-tracking, patch)
- vuldb.com/cve/CVE-2026-82677 (third-party-advisory)
- vuldb.com/submit/893959 (third-party-advisory)
- vuldb.com/vuln/397172 (technical-description, vdb-entry)
- vuldb.com/vuln/397172/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-82677?
- CVE-2026-82677 is a low-severity vulnerability in Valkey-Io Valkey, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 2.4/10. Published 2026-08-31.
- How severe is CVE-2026-82677?
- Low severity. CVSS v3 base score is 2.4 out of 10.